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Is my registraition process secure?

This is my first time creating a user login system from scratch, I was hoping you guys could look over my register.php script and tell me if its secure. I’m using <?php echo $PHP_SELF; ?> as the form action, the script below is my register.php which I have included on the form page at the very top using include("register.php"), and for the form method I used post. Thanks guys :D